POWER block

Power block includes following functions:

- supply voltage generation for system and RF parts and 2.8V to UI

- control of main battery charging

- power on and power off controlling and reset generation

- RTC and RTC backup control

- sleep clock generation

- SIM interface

- A/D conversions

- powering of Memory Card

- Accessory power output generation (through System Connector)

Main components in power block are:

- CCONT2M power ASIC (N100)

- CHAPS charging control ASIC (N101)

- Linear regulator (N102) for VBB

- DC/DC switching regulator (V105) for Vcore

- Linear regulator (N103) for Memory Card powering (VMMC)

- Linear regulator (N104) for Accessory power output (VACC)

- FET (V108) for control of regulators N102 and V105

- 32.768kHz crystal oscillator (32k XTAL B100)

- 2.7V reset device (D101), NC7SZ175 D-flip-flop (D102) and fets (V102, V106) for power on & off control

- 2.0V reset device (D100) for backup disconnection

- ESD protection zener array (V103) for SIM interface

- 2-pin connector (X102) for backup battery (contacts for positive terminals)

- Battery connector (X100) for main battery

- SIM card connector (X101)

Clocking, powering, charging and reset issues of CCONT and CHAPS are covered in separate chapters .

Backup battery is connected to CCONT's VBACK input and it is charged from CHAPS' VBACK supply. Backup battery's positive contacts are made so that VBACK from CHAPS is connected to CCONT only when the battery is installed to the connector X102. Backup battery is located on top of RF shield A501 and grounded through the shield.

2.0V reset device (D100) disconnects backup battery if it's voltage drops too much. This prevents deep discharging which would permanently harm the backup battery.

3. RF+System Module KL8 Technical Documentation

3.0V VMMC supply voltage for Memory Card is generated with linear regulator (N103) from filtered battery voltage (VB). Regulator is controlled with the MMC_PWR signal from MADLinda MPUGenIO5.

Accessory power output (VACC) through the system connector's DCE_DTR line is generated with 3.0 volts linear regulator (N104) from filtered battery voltage (VB). Regulator's feed back resistor are internally disconnected from the output pin when the regulator is not enabled, so output will not affect DCE_DTR line's normal signal usage. VACC regulator is controlled with VACC_CTRL -signal from MADLinda's MPUGenOutl. .

Use of CCONT ADC channels

Following table describes the analogue signals measured with CCONT's A/D converter.

Table 11. ADC in CCONT

PIN no.

CCONT PIN NAME

CONNECTED SIGNAL

MEASURES

ADC input range

A1

RSSI

Not used

0.1V .. Vref

B1

ICHAR

-

Charger current measured through a 0.22Q resistor X101

0.1V .. VBAT+0.4V

D2

VBAT

VB_CCONT

Main battery voltage

0.1V .. VBAT

A3

VCHAR

V_IN

Charger voltage (through voltage division)

0.1V .. Vref

D5

VCXOTEMP

Not used

0.1V .. Vref

B3

BSI

BSI

Main battery size indicator

0.1V .. Vref

C4

BTEMP

BTEMP

Main battery temperature

0.1V .. Vref

A2

EAD

HEADDET

External accessory detect - HEADDET

0.1V .. Vref

The type of the connected main battery is identified from the BSI line's voltage level. This voltage is formed by the system HW's pull-up resistor (100kQ) and battery back's pull-down resistor. Level is read with CCONT's BSI A/D input.

The BSI contact on the battery connector is also used to detect when the battery is being removed to be able to shut down the operations of the SIM card before the power is lost. The BSI contact is shorter than the supply power contacts so this contact breaks first when the battery pack is removed, giving some time for the shut-down operations.

The temperature of the main battery is read from the BTEMP line's voltage level. This voltage is formed by the system HW's pull-up resistor (100kQ) and battery pack's NTC resistor. Level is read with CCONT's BTEMP A/D input.

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